<div>
Try iptables<br />
<br />
If the entry is not in the DNS, it should not get a reply.<br />
<br />
<b>Block Invalid</b><br />

<pre><code id="code-8015772">iptables -A -p tcp -d test.domain.com --dport 80 -j DROP</code></pre>
<br />
<b>Forwarding to another domain</b><br />

<pre><code id="code-8015773">iptables -t nat -A PREROUTING -d test.domain -p tcp --dport 80 -j DNAT --to domain.com</code></pre>
</div>


Try iptables

If the entry is not in the DNS, it should not get a reply.

Block Invalid


iptables -A -p tcp -d test.domain.com --dport 80 -j DROP


Forwarding to another domain


iptables -t nat -A PREROUTING -d test.domain -p tcp --dport 80 -j DNAT --to domain.com

<div>
A follow up question is which is better from an SEO point of view?<br />
<br />
Is it better to make all the sites with broken links that point to my domain still function if someone clicks on the link or Google comes in off that link... by having them redirect to the domain.com version.<br />
<br />
Basically..<br />
<br />
badtext.domain.com/page/pa<wbr />ge.php = .domain.com/page/page.php<br />
<br />
Is that more of a URL rewrite... issue or should i just make anything that does not point to the right domain not work..
</div>


A follow up question is which is better from an SEO point of view?

Is it better to make all the sites with broken links that point to my domain still function if someone clicks on the link or Google comes in off that link... by having them redirect to the domain.com version.

Basically..

badtext.domain.com/page/page.php = .domain.com/page/page.php

Is that more of a URL rewrite... issue or should i just make anything that does not point to the right domain not work..

<div>
<div class="content wysiwyg-content">
How can I force my website to not function when there is a subdomain that is not in the dns.<br />
<br />
ex//<br />
<br />
test.domain.com &lt;- invalice<br />
mail.domain.com &lt;-valid<br />
<br />
how can I force test.domain to go to domain.com is this a dns issue or a server setting?
</div>
</div>


How can I force my website to not function when there is a subdomain that is not in the dns.

ex//

test.domain.com <- invalice
mail.domain.com <-valid

how can I force test.domain to go to domain.com is this a dns issue or a server setting?

Non-Defined Subdomains

The Apache HTTP Server is a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards. Typically Apache is run on a Unix-like operating system, but it is available for a wide variety of operating systems, including Linux, Novell NetWare, Mac OS-X and Windows. Released under the Apache License, Apache is open-source software.

Apache Web Server

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.